Great Lakes Firearms .450 Bushmaster 18" Black Rifle - Model GL15450SSBLK

The Great Lakes Firearms .450 Bushmaster 18" black rifle delivers serious stopping power in a modern, semi-automatic platform built for hunters and shooters who demand performance beyond standard rifle calibers. This AR-pattern rifle chambered in .450 Bushmaster combines a compact 18-inch barrel with an oversized 7075 aluminum upper receiver, purpose-built for medium-range hunting and defensive applications where you need rifle-class energy in a handy package. At 6.4 lbs, it's light enough for a day in the field yet rigid enough for consistent accuracy.

Great Lakes engineered this rifle with practical features for working outdoors. The mid-length gas system and modified M4 feed ramps ensure reliable feeding and cycling, while the full-length Picatinny rail on the 15.25-inch aluminum handguard gives you the flexibility to mount optics, lights, and other accessories without guessing. The 1:24 twist barrel—available in either 416R stainless steel or 4150 CRMOV nitride—is threaded 11/16 x 24 and ships with a muzzle brake designed to be installed without threadlocker. The mil-spec polymer grip and 5.5–6 lb trigger break offer familiar controls for AR shooters, and the rifle ships with one 5-round magazine.

This is a no-frills, purpose-driven rifle for serious hunters and shooters. It arrives with no iron sights, leaving your rail uncluttered for a quality optic or your preferred aiming solution. The lightweight 7075 aluminum receiver, Cerakote finish, and .450 Bushmaster chambering make this an excellent choice if you're moving beyond .223/5.56 and want intermediate-range hunting or defensive capability in a modern platform.

Key Features

• Semi-automatic .450 Bushmaster in a compact 18-inch barrel configuration
• Oversized 7075 aluminum upper receiver paired with 7075 aluminum frame for lightweight rigidity
• Full-length Picatinny rail handguard (15.25 inches) for optics and accessory mounting
• Mid-length gas system with .750 gas block for reliable cycling
• Threaded muzzle (11/16 x 24) with included brake; forward-angled design for wrench installation
• Modified M4 feed ramps for smooth, dependable feeding
• Mil-spec controls: polymer grip and 5.5–6 lb trigger pull
• Cerakote finish for corrosion resistance
• One 5-round magazine included

Specifications

Frequently Asked Questions

Is this .450 Bushmaster rifle good for hunting?

Yes. The .450 Bushmaster is a proven hunting round with stopping power suitable for medium-range game hunting. The 18-inch barrel and compact overall length (35 inches) make it handy in the field or vehicle, while the mid-length gas system and modified M4 feed ramps ensure reliable operation under hunting conditions.

What optics can I mount on this rifle?

The rifle ships with a full-length Picatinny rail on the handguard and an oversized upper receiver, both compatible with standard AR-pattern optic mounts. No sights are included, so you have complete freedom to choose your preferred scope, red dot, or other aiming system based on your hunting or shooting application.

Can I customize or modify the barrel?

The rifle features a threaded muzzle (11/16 x 24) and ships with a muzzle brake. You can swap the brake for a suppressor or other muzzle device. The barrel material is available in your choice of 416R stainless steel or 4150 CRMOV nitride—confirm your selection at purchase. No other barrel specs or aftermarket compatibility information is provided.

What comes in the box?

The rifle includes one 5-round magazine and a muzzle brake pre-installed (with wrench-fitting design and no threadlocker). No other accessories, sights, or optics are included.